Hi, thank you for purchasing my include / exclude extension 🙂
Regarding your questions:
Q1: Each extension is simply a plugin. So you can install it like a normal plugin by go to Plugin page, choose Add New, then choose Upload and upload the .zip file.
After uploading, activate it. That's all.
Q2: Yes, that's correct. For more information, please read the documentation.
Q3: To display meta value in the frontend, you should use the function rwmb_meta(), like this:
echo rwmb_meta( 'field_id' );
For more information about the function arguments, please read this documentation.
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